Lock.



PATENTED DEC. 31, 1907.

A. SGHMIDTKE.

LOGKL APPLICATION FILED MAY 24. 1907.

fz'yi.

AUGUST SOHMIDTKE, OF KGNIGSBERG, GERMANY.

LOCK.

/ Specification of Letters Patent.

Patented Dec. 81, 1907.

Application filed May 24,1907. Serial No. 375,421.

a view on the lock, the cover being omitted to show the inner parts; Fig. 2 is a section through the key-hole; Fig. 3 a view on the A look, showing a safety-contrivance of the same in inoperative position; Fig. 4 a fragmentary view similar to Fig. 3, in operative position; and Fig. 5 a section through the safety-contrivance.

The look a of any ordinary type, contains below the bar a plate 0 which is movably disposed on two guide-pins d and held between springs e in the middle between the walls of the lock. The plate 0 carries the key pintle f with the movable keytube 9 which both project to both sides of the lock. The partition it carries a safety-contrivance comprising the lever i which with the square bolt is is centered on the partition h and at its free end provided with a hook Z which is adapted to project into the slot provided in the key-tube g for the insertion of the key. The spring m is provided to keep the lever i in the engaged position. The insertion of the hook Z into the slot of the key-tube is necessary as the latter could else be turned by the insertion of an instrument so that the key could not be putin. At the same time, however, the lever i affords great security against undue manipulation on the look, as it covers the lower part of the key-hole.

The lock is operated as follows :First, the lever i is turned away from the key-hole by means of a separate key placed on the square bolt it. Then, the latch-key is introduced from either side into the key-hole and pushed back so as to press the plate 0 towards the opposite wall of the lock whereupon the key can be turned and the lock opened, while the closing is efiected by simply reversing the movement. After the removal of the key, the plate 0 jumps back to its middle position between the walls under the influence of the springs 6, while the safety-lever i must then be again put into its operative position before the key-hole.

Having fully described my invention, what I claim and desire to secure by Letters Patent is 1. A door-lock comprising in combination with the look proper ((1), its bar (I?) and the latch-key; a plate (0) movably arranged below said bar in the middle between the walls of the lock, guide-pins ((1) designed to guide said plate, springs (0) designed to keep said plate in its mentioned normal position, the key-pintle (f) integral with said plate, and the movable key-tube (g) provided with a slot for the insertion of said latch-key, both the latter-key-pintle and key-tube-forming the key-hole and projecting to both sides of the look so as to receive said. latch-key from either side of the lock and being capable, through the medium of said latch-key, to be pressed back together with said plate towards the opposite Wall of said lock, for the purpose set forth. l

2. A door-lock comprising in combination with the lock proper, its bar and the latchkey; a plate (a) movably arranged below said bar in the middle between the Walls of the lock, guide-pins designed to guide said plate, springs designed to keep said plate in the mentioned normal position, the key-pintle integral with said plate, andthe movable key-tube provided with a slot for the insertion of said latch-key, both the latter-keypintle and key-tube-forming the key-hole and projecting to both sides of the look so as to receivesaid latch-key from either side of the lock, and a safety-contrivance designed to keep said key-tube in proper position and to cover the lower part of the key-hole and adapted to be turned away from the latter for the insertion of said latch-key, substantially as described and shown.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

AUGUST SOHMIDTKE. Witnesses:

HANS WEINBORN, B. KITTLER. 

